Section 32J. Any person who violates the provisions of section thirty-two, thirty-two A, thirty-two B, thirty-two C, thirty-two D, thirty-two E, thirty-two F or thirty-two I while in or on, or within 300 feet of the real property comprising a public or private accredited preschool, accredited headstart facility, elementary, vocational, or secondary school if the violation occurs between 5:00 a.m. and midnight, whether or not in session, or within one hundred feet of a public park or playground shall be punished by a term of imprisonment in the state prison for not less than two and one-half nor more than fifteen years or by imprisonment in a jail or house of correction for not less than two nor more than two and one-half years. No sentence imposed under the provisions of this section shall be for less than a mandatory minimum term of imprisonment of two years. A fine of not less than one thousand nor more than ten thousand dollars may be imposed but not in lieu of the mandatory minimum two year term of imprisonment as established herein. In accordance with the provisions of section eight A of chapter two hundred and seventy-nine such sentence shall begin from and after the expiration of the sentence for violation of section thirty-two, thirty-two A, thirty-two B, thirty-two C, thirty-two D, thirty-two E, thirty-two F or thirty-two I.
Lack of knowledge of school boundaries shall not be a defense to any person who violates the provisions of this section.
Any person serving a mandatory minimum sentence for violating this section shall be eligible for parole after serving one-half of the maximum term of the sentence if the sentence is to a house of correction, except that such person shall not be eligible for parole upon a finding of any 1 of the following aggravating circumstances:
(i) the defendant used violence or threats of violence or possessed a firearm, rifle, shotgun, machine gun or a weapon described in paragraph (b) of section 10 of chapter 269, or induced another participant to do so, during the commission of the offense;
(ii) the defendant engaged in a course of conduct whereby he directed the activities of another who committed any felony in violation of chapter 94C.
(iii) the offense was committed during the commission or attempted commission of the a violation of section 32F or section 32K of chapter 94C.
A condition of such parole may be enhanced supervision; provided, however, that such enhanced supervision may, at the discretion of the parole board, include, but shall not be limited to, the wearing of a global positioning satellite tracking device or any comparable device, which shall be administered by the board at all times for the length of the parole.